Special Collections Roadshow — Episode Ten: Union Uniform

Special Collections Roadshow was created by the Civil War Institute at Gettysburg College in the Spring of 2014. It normally showcases various artifacts from Special Collections at Gettysburg College. For our tenth episode, we went on the road to the Gettysburg National Military Park. Thank you so much to the park staff, specifically Andrew Newman for letting us film an episode on an enlisted man’s uniform in their facility! [excerpt

Special Collections Roadshow — Episode Seven: Housewife

Special Collections Roadshow was created by the Civil War Institute at Gettysburg College in the Spring of 2014. It showcases various artifacts from Special Collections at Gettysburg College. The seventh episode features Megan McNish ’16 comparing the housewife from Lewis Tway’s collection to another housewife we just received from Rev. Theodore Schlach’s new collection in Special Collections

Find Your Park Friday: Meg and Megan Take Fredericksburg and Spotsylvania NMP

The Civil War Institute will be celebrating the National Park Service Centennial this spring with its brand new “Find Your Park Friday” series. Inspired by the NPS #FindYourPark campaign, the series will challenge our fellows to share their experiences exploring America’s national historical, cultural, and natural resources through trips and internships with the NPS. In our first post, CWI Social Media Coordinators Meg and Megan discuss their time interning at Fredericksburg and Spotsylvania National Military Park. [excerpt

Special Collections Roadshow — Episode Eight: Emory Upton’s Tactical Blocks

Special Collections Roadshow was created by the Civil War Institute at Gettysburg College in the Spring of 2014. Although the series usually showcases various artifacts from Special Collections at Gettysburg College, for our eighth episode we went on the road to the US Army Heritage and Education Center in Carlisle, PA

Special Collections Roadshow – Episode 9: Medical Kit

For our ninth episode we welcome our guest Dr. Ian Isherwood ’00 to talk about a Civil War medical kit and how to do research relating to Civil War medicine, as seen in the PBS series, Mercy Street. [excerpt

Atom clusters and vibrational excitations in chemically-disordered Pt357Fe

Inelastic nuclear resonant scattering spectra of Fe-57 atoms were measured on crystalline alloys of Pt3Fe-57 that were chemically disordered, partially ordered, and L1(2) ordered. Phonon partial density of states curves for Fe-57 were obtained from these spectra. Upon disordering, about 10% of the spectral intensity underwent a distinct shift from 25 to 19 meV. This change in optical modes accounted for most of the change of the vibrational entropy of disordering contributed by Fe atoms, which was (+0.10 +/- 0.03) k(B) (Fe atom)(-1). Prospects for parametrizing the vibrational entropy with low-order cluster variables were assessed. To calculate the difference in vibrational entropy of the disordered and ordered alloys, the clusters must be large enough to account for the abundances of several of the atom configurations of the first-nearest-neighbor shell about the Fe-57 atoms

Structural characterization of a first-generation articulated-truss joint for space crane application

A first-generation space crane articulated-truss joint was statically and dynamically characterized in a configuration that approximated an operational environment. The articulated-truss joint was integrated into a test-bed for structural characterization. Static characterization was performed by applying known loads and measuring the corresponding deflections to obtain load-deflection curves. Dynamic characterization was performed using modal testing to experimentally determine the first six mode shapes, frequencies, and modal damping values. Static and dynamic characteristics were also determined for a reference truss that served as a characterization baseline. Load-deflection curves and experimental frequency response functions are presented for the reference truss and the articulated-truss joint mounted in the test-bed. The static and dynamic experimental results are compared with analytical predictions obtained from finite element analyses. Load-deflection response is also presented for one of the linear actuators used in the articulated-truss joint. Finally, an assessment is presented for the predictability of the truss hardware used in the reference truss and articulated-truss joint based upon hardware stiffness properties that were previously obtained during the Precision Segmented Reflector (PSR) Technology Development Program